Q.

Hydrogen is evolved by the action of cold dilute HNO3 on

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a

Fe

b

Mn

c

Cu

d

Al

answer is B.

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Detailed Solution

Very dilute (about 1%) HNO3 reacts with Mg and Mn at room temperature to give nitrates and H2g Mn+2HNO3→  MnNO32+H2↑H2g
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